vanhise]  LAKE    SUPERIOR   REGION.  203 
Sources  of  the  Mississippi  River,  and  the  Great  Lake  Basins,  during  the  Expedition 
of  1820,  Henry  R.  Schoolcroft,  Summary  Narrative  of  an  Exploratory  Expedition 
to  the  Sources  of  the  Mississippi  River,  in  1820 ;  Resumed  and  Completed  hy  the  Dis- 
covery of  its  Origin  in  Itasca  Lake,  in  1832,  Henry  R.  Schoolcraft.     Pages  303-362. 
85  Remarks  on  Some  Points  Connected  with  the  Geology  of  the  North  Shore  of  Lake 
Superior,  J.  D.  Whitney.     Proc.  Am.  Assoc.  Adv.  Sci.,  1855,  9th  Meeting,  pp.  204-209. 
86  On  the  Occurrence  of  the  Ores  of  Iron  in  the  Azoic  System,  J.  D.  Whitney.  Ibid., 
pp.  209-216. 
"Remarks  on  the  Huronian  and  Lauren  ti  an  Systems  of  the  Canada  Geological 
Survey,  J.  D.  Whitney.     Am.  Jour.  Sci.,  2d  ser.,  vol.  xxiii,  pp.  305-314. 
88  Age  of  the  Lake  Superior  Sandstone,  Charles  T.  Jackson.  Proc.  Bost.  Soc.  Nat. 
Hist.,  1860,  vol.  vii,  pp.  396-398. 
89  Age  of  the  Sandstone,  William  B.  Rogers.     Ibid.,  pp.  394,  395. 
90  Some  Contributions  to  a  knowledge  of  the  constitution  of  the  Copper  Range 
of  Lake  Superior,  C.  P.  Williams  and  J.  F.  Blandy.  Am.  Jour.  Sci.,  2d  ser.,  vol.  xxxiv, 
pp.  112-120. 
91  On  the  Iron  Ores  of  Marquette,  Michigan,  J.  P.  Kimball.  Ibid.,  vol.  XL,  pp.  290- 
303. 
9-  On  the  Position  of  the  Sandstone  of  the  Southern  Slope  of  a  portion  of  Keweenaw 
Point,  Lake  Superior,  Alexander  Agassiz.  Proc.  Bost.  Soc.  Nat.  Hist.,  vol.  xi,  1867, 
pp.  244-246. 
9J  Physical  Geology  of  Lake  Superior,  Charles  Whittlesey.  Proc.  Am.  Assoc.  Adv. 
Sci.,  24th  Meeting,  1875,  part  2,  pp.  60-72,  with  map. 
94  Notes  on  the  Iron  and  Copper  Districts  of  LakenSuperior,  M.  E.  Wadsworth.  Bull. 
Mus.  Comp.  Zool.  Harvard  College,  whole  series,  vol.  vn;  Geological  series,  vol.  i, 
No.  1,  pp.  157.  See  also  by  the  same  author,  on  the  Origin  of  the  Iron  Ores  of  the 
Marquette  District,  Lake  Superior.  Proc.  Bost.  Soc.  Nat.  Hist.,  vol.  xx,  1878-'80, 
pp.  470-479.  On  the  Age  of  the  Copper-bearing  Rocks  of  Lake  Superior  (abstract) ; 
Proc.  Am.  Assoc.  Adv.  Sci.,  29th  Meeting,  pp.  429-430.  On  'the  Relations  of  the 
"  Keweenaw  an  Series"  to  the  Eastern  Sandstone  in  the  vicinity  of  Torch  Lake, 
Michigan;  Proc.  Bost.  Soc.  Nat.  His.,  vol.  xxiii,  1884-'88,  pp.  172-180;  Science,  vol. 
I,  pp.  248,  249,  307. 
9^On  a  Supposed  Fossil  from  the  Copper-Bearing  Rocks  of  Lake  Superior,  M.  E. 
Wadsworth.    Proc.  Bost.  Soc.  Nat.  Hist.,  vol.  xxiii,  1884-'88,  pp.  208-212. 
^  Third  Annual  Report  of  the  Geological  Survey  of  Michigan,  Douglass  Houghton. 
State  of  Michigi   ,,  House  of  Representatives,  No.  8,  pp.  1-33. 
97 Fourth  Annij  1  Report  of  the  State  Geologist,  Douglass  Houghton.  Ibid.,  No.  27, 
pp.  184.  See, I  ,so  Metalliferous  Veins  of  the  Northern  Peninsula  of  Michigan, 
Douglass  Hou/  .rton.     Am.  Jour.  Sci.,  1st  ser.,  vol.  xli,  1841,  pp.  183-186. 
98  First  Bie/ -rial  Report  of  the  Progress  of  the  Geological  Survey  of  Michigan, 
Alexander  Winchell.     Lansing,  1861,  pp.  339. 
•  "Dievorsilurischen  Gebilde  der  "Obern  Halbinsel  von  Michigan"  inNord-Amerika, 
Hermann  Credner.  Zeits.  der  Deutsch.  Geol.  Gesell.,  vol.  xxi,  1869,  j>p.  516-554. 
See  also  Die  Gliederung  der  eozoischen  (vorsilurischen)  Formationsgruppe  Nord- 
AiiKi'ikas,  Hermann  Credner.  Zeits.  fur  die  Gesammten  Naturwissensckaften,  Giebel, 
1868,  vol.  xxxii,  pp.  353-405. 
100  On  the  Age  of  the  Copper-Bearing  Rocks  of  Lake  Superior,  T.  B.  Brooks  and 
R.  Pumpelly.     Am.  Jour.  Sci.,  3rd  ser.,  vol.  Ill,  1872,  pp.  428-432. 
101  Iron-Bearing  Rocks,  T.  B.  Brooks.  Geol.  Survey  of  Michigan,  vol.  I,  part  1, 
1869-73,  pp.  319,  with  maps. 
10-  Copper-Bearing  Rocks,  R.  Pumpelly.    Ibid.,  part  2,  pp.  1-46,  62-94,  with  maps. 
103  Copper-Bearing  Rocks,  A.  R.  Marvine.     Ibid.,  part  2.  pp.  47-61,  95-140. 
104 Paleozoic  Rocks,  Charles  Rominger.    Ibid.,  part  3,  pp.  105. 
10fi  Observations  on  the  Ontonagon  Silver  Mining  District  and  the  Slate  Quarries  of 
Huron  Bay,  Charles  Rominger.    Geol.  Survey  of  Michigan,  vol.  in,  part  1,  1876,  pp 
151-166. 
